Importance

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Abstract

In order to realize notification of an incoming call at a client terminal utilizing an existing extension switch system, an exchange of the extension switch system is linked with a server of client terminals such that notification of an incoming call to an extension is made also at a client terminal. Further, whether an incoming call to a client terminal is permitted or not can be changed depending on whether the client terminal is in a log-in state or not. Still further, notification of an incoming call to a client terminal is made by reproducing an audio file or the like to realize a flexible extension call. Further, a response to an incoming call at a client terminal is managed by a timer such that, in case of time out, an ordinary extension rings. Still further, the server is made to have alternative recipient information such that notification of an incoming call is transferred via the server.

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First Claim